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LAPSE:2023.22417v1

Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

Guyue Zou, Yuhuan Liu, Qi Zhang, Ting Zhou, Shuyu Xiang, Zhiqiang Gu, Qiaoyun Huang, Hongbin Yan, Hongli Zheng, Xiaodan Wu, Yunpu Wang, Roger Ruan, Mingzhi Liu

March 24, 2023

Abstract
Fresh pig urine is unsuitable for microalgae cultivation due to its high concentrations of NH4+-N, high pH and insufficient magnesium. In this study, fresh pig urine was pretreated by dilution, pH adjustment, and magnesium addition in order to polish wastewater and produce microalgae biomass. Chlorella vulgaris was cultured in an in-house-designed light-receiving-plate (LRP)-enhanced raceway pond to treat the pretreated pig urine in both batch and continuous mode under outdoor conditions. NH4+-N and TP in wastewater were detected, and the growth of C. vulgaris was evaluated by chlorophyll fluorescence activity as well as biomass production. Results indicated that an 8-fold dilution, pH adjusted to 6.0 and MgSO4·7H2O dosage of 0.1 mg·L−1 would be optimal for the pig urine pretreatment. C. vulgaris could stably accumulate biomass in the LRP-enhanced raceway pond when cultured by both BG11 medium and the pretreated pig urine. About 1.72 g·m−2·day−1 of microalgal biomass could be produced and 98.20% of NH4+-N and 68.48% of TP could be removed during batch treatment. Hydraulic retention time of 7-9d would be optimal for both efficient nutrient removal and microalgal biomass production during continuous treatment.

Record ID

LAPSE:2023.22417v1

Keywords

Chlorella vulgaris, chlorophyll fluorescence, hydraulic retention time, nutrient removal, photosynthetic reactor, pig urine

Subject

Process Design

Suggested Citation

Zou G, Liu Y, Zhang Q, Zhou T, Xiang S, Gu Z, Huang Q, Yan H, Zheng H, Wu X, Wang Y, Ruan R, Liu M. Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine. (2023). LAPSE:2023.22417v1

Author Affiliations

Zou G: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Liu Y: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Zhang Q: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Zhou T: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Xiang S: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Gu Z: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Huang Q: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Yan H: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Zheng H: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Wu X: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Wang Y: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Ruan R: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China; Center for Bioreﬁning and Department of Bioproducts and Biosystems Engineering, University of Minnesota, Paul, MN 55108, USA [ORCID]
Liu M: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China

Journal Name

Energies

Volume

Issue

Article Number

E1644

Year

2020

Publication Date

2020-04-02

DOI:

https://doi.org/10.3390/en13071644